The Unterlinden Museum (officially Musée Unterlinden) is located in Colmar, France, in the Alsace region. The museum, housed in a 13th-century Dominican religious sisters' convent and a 1906 former public baths building, is home to the Isenheim Altarpiece by Matthias Grünewald and features a large collection of local and international artworks and manufactured artifacts from prehistorical to contemporary times. The museum bears the quality label Musée de France and is one of the most visited in France outside of the Île-de-France.

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The museum was established in 1849, the buildings (abandoned following the French Revolution) having been saved by the Societé Schongauer (founded in 1847 by Louis Hugot [3]) and bequeathed to it by the municipality. The collection at first centered around a Roman mosaic found in Bergheim, Haut-Rhin, still displayed today, and plaster copies of antique sculptures on loan from the Louvre. In 1852, the focus of the collection shifted dramatically, when the Isenheim Altarpiece as well as most of the other large painted and/or sculpted altarpieces from former Colmar or Upper Rhenish churches, abbeys and monasteries, were installed in the building. The museum opened its doors to the general public in the following year, 1853.[4]

In the 1950s and again in the 1980s, the need appeared for the museum, which had seen a steady growth of the number of its displayed artefacts in every domain, to gain more space by using available surface more appropriately, and was each time addressed as far as the classified character of the building in itself could allow. When that same need appeared again in the 2000s, the city of Colmar decided to add supplementary buildings. As the museum's official website used to state before the opening of the 2015 extension : "Today the museum covers a surface area of about 5,620 m², including exhibition spaces (4,000 m²), conservation, storage and other work areas (1,370 m²), and offices (250 m²)".[5] Between 2009 and 2015, the adjacent, Neo-Baroque former baths building was transformed into an annex of the museum, connected to the old building by a series of underground exhibition rooms. A new building for temporary exhibitions was also added while the former cloister was once again thoroughly renovated and its interior spaces redistributed. The total area open to the public was thus enlarged to 8,000 m2 (86,000 sq ft), at an official cost of 44 M€,[6] although it appeared at the end of the year 2016 that the final cost was actually of 48,7 M€, a fact which infuriated Colmar's long-time mayor, Gilbert Meyer.[7][8] The opening of the enlarged museum took place on 12 December 2015.

In order to renovate the museum and provide more space to the its collections, in 2009 the Colmar municipality organized a design competition, and eventually selected the Swiss architects Herzog & de Meuron to design the renovation project. The new venue, which almost doubles the floor area of the old Unterlinden museum, was inaugurated January 23, 2016 by the President of France François Hollande.[11]